> -----Original Message-----
> From: Ben Jackson [SMTP:ben@BEN.COM]
> Sent: Thursday, April 24, 2003 8:02 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: 7812 Unstable
>
> On Fri, Apr 25, 2003 at 02:13:36AM -0700, Quah wrote:
> >
> > The issue now is the input capacitor to the 7812.  The input capacitor I
> > am not sure I need to add into my circuit because the input voltage is
> > from an Unregulated Adaptor of 12 V.
>
> Wait, the input transformer is 12V?  Doesn't the 7812 need at least
> 15V input to provide a good 12V output?
>
A good point. An unregulated wall wart style supply gives around 16 volts
off load, which droops with increasing current.  This may be ok depending on
the maximum current required.

Mike


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